Yesterday's Tractor Co. The Right Parts, Right Away
Click Here or call 800-853-2651 
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 
Marketplace
Tractor Manuals
Tractor Parts
Classified Ads
Photo Ads

Community
Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Galleries
Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Articles
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs
Glossary

Miscellaneous
Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
TractorLinks.com
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Enter your email address to receive our newsletter!

subscribe
unsubscribe
  
Tool Talk Discussion Forum

pulsing ammeter

Author  [Modern View]
dale kahler

12-19-2013 06:49:55
65.127.84.74



Report to Moderator

I recently replaced the generator for an alternator. Its a delco internally regulated 2-wire setup using a 2 1/2" pulley to keep the rpm in a proper range. The battery is charging at 14.6 volts, the ammeter is discharging when lights are turned on, engine on or off-normal. I have eliminated the internal regulator as usual and made sure the ground is solid. The ammeter pulses at any rpm above 800, as well as the lights slightly as expected. I know plenty of people who are familiar with this problem but no solution yet. I even tried running a temporary ground directly form the battery to the alternator to make sure the ground was solid, no difference. The alternator is a 37 amp and the ammeter is a 60 amp on a D17 allis chalmers. Any light you could shed on this would be greatly appreciated. Many thanks!!

[Reply]   [No Email]
ohfred1941

12-20-2013 22:04:47
71.72.238.190



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
I know one thing, I can't measure a thing with a digital meter, takes an analog meter to measure mine when it is running. Digital won't settle, it just keeps wandering. ohfred



[Reply]  [No Email]
ASEguy

12-20-2013 03:24:17
24.207.160.166



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
What does the voltage do with the lights on? If it drops below 13.2 then do as JMOR stated and full field the alternator, but only do so at fast idle and for no more than 10 seconds. Let us know what the readings are. All this assumes proper wiring. Gerard



[Reply]  [No Email]
RONNIE GRAVES

12-19-2013 21:21:37
64.12.112.104



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
ok set your volt meter to AC VOLTAGE and see what it reads at the stud ,if you got a good meter you can tell it to hold that reading if any voltage over about 1 volt you will need new diodes in the alt



[Reply]  [No Email]
buickanddeere

12-19-2013 16:11:38
209.240.119.130



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
A swap from P ground to N ground will make an ammeter read backwards. Does the pulsing occur at all rpms and all alternator loads ?



[Reply]  [No Email]
sotxbill

12-19-2013 15:25:54
69.152.224.148



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
probably wired alternator to wrong place and the amp meter is on the wrong side. Or charge wire is too small or mostly burned up...somehow high resistance or even open.



[Reply]  [No Email]
John B.

12-19-2013 13:57:29
50.40.67.67



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
I suspect your pulley is slipping on the alternator shaft. The pulley on the generator may be a little larger in diameter but the bore is the same and should fit right on your alternator. I've switched many pulleys from the generators to alternators so you can use the same belt.



[Reply]  [No Email]
Bob

12-19-2013 09:55:31
64.255.159.192



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
ASSUMING the belt is not slipping,do you have it wired correctly with the #2 "Voltage Sense" terminal connected to the large output stud, or, even better, to a point nearer the battery, such as the starter solenoid's battery cable terminal and the #1 "excite" terminal connected to an idiot light or fed from "ignition power" through a resistor or diode?



[Reply]  [No Email]
dale kahler

12-19-2013 12:25:25
65.127.84.74



Report to Moderator
 Re: pulsing ammeter in reply to Bob, 12-19-2013 09:55:31  
The belt is new and the pulley is the correct pitch and width and is also new. I actually bought a new 2 1/2" pulley with a 5/8" bore, then did some lathe work boring it to the required .670" bore and machining off the extra step. The belt is tightened enough so the belt can be depressed the same ammount as its width, this isn't my first rodeo. Yes the voltage sense terminal is connected to the output stud. The excite wire is run through a diode also. The alternator plug-in is new, the alternator has been rebuilt, but that doesn't mean everything is working properly. Obviously I am missing something and have considered alternator internal issues even though I rebuilt it. I have had the battery tested, it also is new. Ignition switch has also been replaced as it was long over due, this problem existed before the switch was replaced also. Thanks to everyone and their comments, we'll see what happens and I'll let you know what I find out.

[Reply]  [No Email]
JMOR

12-19-2013 14:15:38
72.181.173.171



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 12:25:25  
dale, stick a small metal probe/screwdriver/awl/whatever into the alt "D" hole to bypass the VR & force full output & observe ammeter under those conditions.



[Reply]  [No Email]
old

12-19-2013 12:53:02
209.86.226.40



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 12:25:25  
Sounds like time to pull the alternator off and take it to an auto parts tore and have it checked on there test machine. All it takes is one small thing getting ad to make one not work as well as it should



[Reply]  [No Email]
old

12-19-2013 08:25:06
209.86.226.32



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
Well one thing is 2 wire?? If you only how 2 wires hooked up instead of the correct 3 then that could cause some of your problem. But like Bob said a fan belt slipping will cause that also



[Reply]  [No Email]
Unforgiven

12-19-2013 08:45:08
66.146.251.119



Report to Moderator
 Re: pulsing ammeter in reply to old, 12-19-2013 08:25:06  
What difference does it make if he has a one, two, or three wire system? I'm running some two and one wires and have not had any pulsing problems.



[Reply]  [No Email]
old

12-19-2013 09:00:47
209.86.226.32



Report to Moderator
 Re: pulsing ammeter in reply to Unforgiven, 12-19-2013 08:45:08  
Very simple if the #2 wire is not there it will not sense the state of the battery and can in turn, turn on and off the alternator which would cause just such a problem



[Reply]  [No Email]
George Marsh

12-19-2013 07:05:49
50.121.6.110



Report to Moderator
 Re: pulsing ammeter in reply to dale kahler, 12-19-2013 06:49:55  
I'm confused: "The battery is charging at 14.6 volts, the ammeter is discharging when lights are turned on, engine on or off-normal."

If ammeter is discharging when lights are on and engine is on, then alternator has an issue.

The first thing I would do is remove alternator and take it to Napa or Auto Zone and have it checked out.

Second, I would also take battery to town and have it checked out too.

Third is where the fun begins. Someplace you have either a bad connection, or the lights are drawing too many amps, short. I once had ground strap with a lose connection.

My alternators don't start charging until the RPM's are above 1200. When alternator wakes up I can slow engine down a little and it still works.

I would also put a voltmeter on battery. Ammeter pulses, the voltmeter should pulse a little.

Good luck. Let us know what you find.
George

[Reply]  [No Email]
dale kahler

12-20-2013 13:25:41
67.142.166.20



Report to Moderator
 Re: pulsing ammeter in reply to George Marsh, 12-19-2013 07:05:49  
In clarification about the ammeter discharging when the lights were on and the tractor running that was stated wrong. In reply to the pulsing issue I knew that the belt, pulley, wiring etc. were not the issue and liked to think a rebuilt alternator could be ruled out, but knew it couldn"t, but it was all that was left. I did take the alternator in and have it tested, to my delight it also pulsed the ammeter on the bench test. As it happens all too often new parts are faulty and this was the end result here on the rebuild. All the alternators I have built through the years and never an issue, there"s always a first! I bought a new 10SI delco alternator 2-wire, 3-wire whatever people want to call it, and this ended the pulsing as expected. Thanks again to all who commented in the forum and happy problem solving! Merry Christmas!

[Reply]  [No Email]
soundguy

12-19-2013 15:16:31
207.30.46.70



Report to Moderator
 Re: pulsing ammeter in reply to George Marsh, 12-19-2013 07:05:49  
i'd double check that wireing and ammeter and make sure it is all setup for net charge / discharge.



[Reply]  [No Email]
Bob M

12-19-2013 07:18:46
74.67.186.230



Report to Moderator
 Re: pulsing ammeter in reply to George Marsh, 12-19-2013 07:05:49  
A slipping belt can also cause rhythmic pulsations in alternator output. Before getting in too deep with other stuff make sure the belt is tight, clean and seats properly the in the alternator sheave groove.



[Reply]  [No Email]
John T

12-19-2013 07:44:51
216.249.76.176



Report to Moderator
 Re: pulsing ammeter in reply to Bob M, 12-19-2013 07:18:46  
Good point Robert, how may times have you seen slick looking glazed cupped/dished out Alternator belts and dished out pulleys !!! Often times an alternator belt needs to be tighter then Dicks Hat Band to work properly, and that seems such an awful load on the bearings to me. Its amazing how much better the new multi grooved serpentine belts work and not as tight either. My truck AC compressor was locking up and the belt worked so good it could actually killed the engine, you wouldn't see that happen with a v belt, it would just slip and burn up. Also on my old 460 powered Ford RV's there were like 4 freaking belts to worry with and keep tight and adjust grrrrrrrrrr PS and AC and Fan and Smog Pump (or something like that, I forget) each had their own belts and the one that broke was ALWAYS the one in the rear so you had to loosen or remove alllllllllll the others to get to it grrrrrrrr Now my 454 Chevy has but ONE serpentine belt yayyyyyyyyyyy

Merry Christmas Bob

John T

[Reply]  [No Email]
[Options]  [Printer Friendly]  [Return to Forum]   [Add a Reply]

Hop to:
TRACTOR   PARTS TRACTOR   MANUALS
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F).  Expedited shipping available, just call!  Most prices for parts and manuals are below our competitors.  Compare our super low shipping rates!  We have the parts you need to repair your tractor.  We are a Company you can trust and have generous return policies!   Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]

Home  |  Forums


Copyright © 1997-2014 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters